svn commit: r340665 - user/pho/stress2/misc
Peter Holm
pho at FreeBSD.org
Tue Nov 20 09:30:27 UTC 2018
Author: pho
Date: Tue Nov 20 09:30:26 2018
New Revision: 340665
URL: https://svnweb.freebsd.org/changeset/base/340665
Log:
Added a kevent(2) test.
PR: 228858
Sponsored by: Dell EMC Isilon
Added:
user/pho/stress2/misc/kevent12.sh (contents, props changed)
Added: user/pho/stress2/misc/kevent12.sh
==============================================================================
--- /dev/null 00:00:00 1970 (empty, because file is newly added)
+++ user/pho/stress2/misc/kevent12.sh Tue Nov 20 09:30:26 2018 (r340665)
@@ -0,0 +1,234 @@
+#!/bin/sh
+
+#
+# SPDX-License-Identifier: BSD-2-Clause-FreeBSD
+#
+# Copyright (c) 2018 Dell EMC Isilon
+#
+# Redistribution and use in source and binary forms, with or without
+# modification, are permitted provided that the following conditions
+# are met:
+# 1. Redistributions of source code must retain the above copyright
+# notice, this list of conditions and the following disclaimer.
+# 2. Redistributions in binary form must reproduce the above copyright
+# notice, this list of conditions and the following disclaimer in the
+# documentation and/or other materials provided with the distribution.
+#
+# THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
+# ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+# IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
+# ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
+# FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
+# DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
+# OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
+# HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
+# LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
+# OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
+# SUCH DAMAGE.
+#
+# $FreeBSD$
+#
+
+# Bug 228858 - panic when delivering knote to a process who has opened a
+# kqueue() is dying
+# Page fault seen: https://people.freebsd.org/~pho/stress/log/mark052.txt
+
+# Test scenario based on analysis by siddharthtuli gmail com
+
+. ../default.cfg
+
+odir=`pwd`
+
+cd /tmp
+sed '1,/^EOF/d' < $odir/$0 > kevent12.c
+mycc -o kevent12 -Wall -Wextra -O2 -g kevent12.c || exit 1
+rm -f kevent12.c
+cd $odir
+
+(cd $odir/../testcases/swap; ./swap -t 5m -i 20 -l 100 > /dev/null 2>&1) &
+pid=$!
+/tmp/kevent12
+while pgrep -q swap; do
+ pkill -9 swap
+done
+wait $pid
+
+rm -f /tmp/kevent12
+exit 0
+EOF
+#include <sys/types.h>
+#include <sys/event.h>
+#include <sys/wait.h>
+
+#include <err.h>
+#include <errno.h>
+#include <signal.h>
+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+#include <time.h>
+#include <unistd.h>
+
+#define PARALLEL 64
+#define RUNTIME (5 * 60)
+
+static pid_t parent;
+static int kq;
+
+static void
+hand(int i __unused) { /* handler */
+ kill(parent, SIGINT);
+ _exit(1);
+}
+
+static void
+init_kq()
+{
+ kq = kqueue();
+ if (kq == -1)
+ err(1, "kqueue");
+}
+
+static void
+add_watch(pid_t pid)
+{
+ struct kevent kev;
+ char msg[64];
+
+ bzero(&kev, sizeof(kev));
+ kev.ident = pid;
+ kev.flags = EV_ADD | EV_ENABLE;
+ kev.filter = EVFILT_PROC;
+ kev.fflags = NOTE_EXIT | NOTE_EXEC | NOTE_TRACK | NOTE_TRACKERR;
+
+ for (;;) {
+ int res = kevent(kq, &kev, 1, NULL, 0, NULL);
+ if (res == -1) {
+ if (errno == EINTR)
+ continue;
+ if (errno == ESRCH)
+ break;
+
+ snprintf(msg, sizeof(msg),
+ "kevent - add watch for pid %u", pid);
+ err(1, "%s", msg);
+ }
+ else
+ break;
+ }
+}
+
+static void
+polling()
+{
+ struct kevent kev[10];
+#if defined(DEBUG)
+ pid_t pid;
+ int i;
+#endif
+
+ for (;;) {
+ bzero(&kev, sizeof(kev));
+ if (arc4random() % 100 < 10) {
+ signal(SIGALRM, hand);
+ ualarm(10000, 0);
+ }
+ int res = kevent(kq, NULL, 0, kev,
+ sizeof(kev) / sizeof(kev[0]), NULL);
+ if (res == -1) {
+ if (errno == EINTR)
+ continue;
+
+ if (errno == ESRCH)
+ continue;
+
+ err(1, "kevent");
+ }
+
+#if defined(DEBUG)
+ for (i = 0; i < res; i++) {
+ pid = kev[i].ident;
+ if (kev[i].fflags & NOTE_CHILD) {
+ add_watch(pid);
+ printf("%u - new process, parent %u\n", pid,
+ (unsigned int)kev[i].data);
+ }
+ if (kev[i].fflags & NOTE_FORK) {
+ printf("%u forked\n", pid);
+ }
+ if (kev[i].fflags & NOTE_EXEC) {
+ printf("%u called exec\n", pid);
+ }
+ if (kev[i].fflags & NOTE_EXIT) {
+ printf("%u exited\n", pid);
+ if (parent == pid)
+ return;
+ }
+ if (kev[i].fflags & NOTE_TRACK) {
+ printf("%u forked - track\n", pid);
+ }
+ if (kev[i].fflags & NOTE_TRACKERR) {
+ fprintf(stderr, "%u - track error\n", pid);
+ }
+ }
+#endif
+ }
+}
+
+void
+churn(void)
+{
+ pid_t pid;
+ time_t start;
+ char *cmdline[] = { "/usr/bin/true", NULL };
+
+ start = time(NULL);
+ while (time(NULL) - start < RUNTIME) {
+ if ((pid = fork()) == -1)
+ err(1, "fork");
+ if (pid == 0) {
+ if (execve(cmdline[0], cmdline, NULL) == -1)
+ err(1, "execve");
+ }
+ if (waitpid(pid, NULL, 0) != pid)
+ err(1, "waitpid(%d):%d", pid, __LINE__);
+ }
+
+ _exit(0);
+}
+
+int
+test(void)
+{
+ if ((parent = fork()) == 0)
+ churn();
+
+ init_kq();
+ add_watch(parent);
+ polling();
+ if (waitpid(parent, NULL, 0) != parent)
+ err(1, "waitpid(%d):%d", parent, __LINE__);
+
+ _exit(0);
+}
+
+int
+main(void)
+{
+ pid_t pids[PARALLEL];
+ time_t start;
+ int i;
+
+ start = time(NULL);
+ while (time(NULL) - start < RUNTIME) {
+ for (i = 0; i < PARALLEL; i++) {
+ if ((pids[i] = fork()) == 0)
+ test();
+ }
+ for (i = 0; i < PARALLEL; i++)
+ if (waitpid(pids[i], NULL, 0) != pids[i])
+ err(1, "waitpid(%d):%d", pids[i], __LINE__);
+ }
+
+ return (0);
+}
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